Stellar populations of galaxies in the LAMOST spectral survey
arXiv:2110.11610 · doi:10.3847/1538-4365/ac3241
Abstract
We firstly derive the stellar population properties: age and metallicity for 43,000 low redshift galaxies in the seventh data release (DR7) of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey, which have no spectroscopic observations in the Sloan Digital Sky Survey(SDSS). We employ a fitting procedure based on the small-scale features of galaxy spectra so as to avoid possible biases from the uncertain flux calibration of the LAMOST spectroscopy. We show that our algorithm can successfully recover the average age and metallicity of the stellar populations of galaxies down to signal-to-noise5 through testing on both mock galaxies and real galaxies comprising LAMOST and their SDSS counterparts. We provide a catalogue of the age and metallicity for 43,000 LAMOST galaxies online. As a demonstration of the scientific application of this catalogue, we present the Holmberg effect on both age and metallicity of a sample of galaxies in galaxy pairs.
15 pages, 9 Postscript figures, accepted for publication in The Astrophysical Journal Supplement Series
References in corpus (13)
- The Sixteenth Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra
- Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
- Evolutionary Stellar Population Synthesis with MILES. Part I: The Base Models and a New Line Index System
- Galaxy Pairs in the Sloan Digital Sky Survey I: Star Formation, AGN Fraction, and the Luminosity/Mass-Metallicity Relation
- UV-extended E-MILES stellar population models: young components in massive early-type galaxies
- Recovering galaxy star formation and metallicity histories from spectra using VESPA
- Firefly (Fitting IteRativEly For Likelihood analYsis): a full spectral fitting code
- P-MaNGA: Full spectral fitting and stellar population maps from prototype observations
- Stellar population models based on the SDSS-IV MaStar library of stellar spectra. I. Intermediate-age/old models
- Spectral classification and composites of galaxies in LAMOST DR4
- Estimating dust attenuation from galactic spectra. I. methodology and tests
- Central velocity dispersion catalog of LAMOST-DR7 galaxies
- The LAMOST Complete Spectroscopic Survey of Pointing Area (LaCoSSPAr) in the Southern Galactic Cap I. The Spectroscopic Redshift Catalog